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Two radioactive materials X1 and X2 have decay constants 10λ a
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Two radioactive materials X1 and X2 have decay constants 10λ and λ respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of X1 to that of  X2 will be 1/e after a time

A
110λ

B
111λ

C
1110λ

D
19λ

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Two radioactive materials X1 and X2 have decay constants 10λ and λ respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of X1 to that of  X2 will be 1/e after a time
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[d] N1=N0e−10λt and N2=N0e−λt. ∴N1N2=e−10λte−λt=1e9λt Given N1N2=1e;∴1e9λt=1e or,        9λt=1          or  t=(19λ)
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Question Text
Two radioactive materials X1 and X2 have decay constants 10λ and λ respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of X1 to that of  X2 will be 1/e after a time
Answer TypeText solution:1
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